Posted by sherry on Thursday, February 16, 2012 at 9:16am.
It can bounce to 40% of the original height, or 4 meters in this case.
If the energy is reduced by 40%, then 60% is left. Therefore, PE = mgH = KE (at hitting the ground). Upward motion
0.6KE=0.6mgH = mgh. Then h=0.6x10=6 m.
Yes, I misread the question. 60% of the original height is correct
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